Apparatus of multiple targets management for multistatic PCL based target localization

Abstract

This application relates to a passive coherent location (PCL) system. In one aspect, the PCL system includes a signal measurement device configured to receive a plurality of signals from a plurality of illuminators and generate an In-phase signal and a Quadrature signal corresponding to each illuminator using the received signals. The PCL system also includes a signal processing device configured to detect a first target using the In-phase and Quadrature signals and measure a bistatic range of the first target and a bistatic velocity of the first target to generate a plurality of pieces of line track information corresponding to the first target. The PCL system further includes a locating device configured to generate target track information of the first target using the line track information and predict a position vector and a velocity vector of the first target using the target track information.

What is claimed is: 
     
       1. A passive coherent location (PCL) system comprising:
 a signal measurement device configured to receive a plurality of signals from a plurality of illuminators and generate an In-phase signal and a Quadrature signal corresponding to each of the plurality of illuminators using the plurality of received signals; 
 a signal processing device configured to detect a first target using the In-phase signal and the Quadrature signal and measure a bistatic range of the first target and a bistatic velocity of the first target to generate a plurality of pieces of line track information corresponding to the first target; and 
 a locating device configured to generate target track information of the first target using the plurality of pieces of line track information and predict a position vector of the first target and a velocity vector of the first target using the target track information, 
 wherein the first target includes a plurality of targets. 
 
     
     
       2. The PCL system of  claim 1 , wherein the signal measurement device comprises:
 an antenna array configured to receive the plurality of signals; and 
 a plurality of signal measurement units configured to generate the In-phase signal and the Quadrature signal corresponding to each of the plurality of illuminators using the plurality of received signals. 
 
     
     
       3. The PCL system of  claim 2 , wherein the signal processing device comprises a plurality of signal processors corresponding to the plurality of illuminators, and
 wherein the signal processors are configured to manage the plurality of pieces of line track information. 
 
     
     
       4. The PCL system of  claim 3 , wherein the locating device comprises:
 a line track information combiner configured to classify the plurality pieces of line track information based on the plurality of illuminators; 
 a multiple target association unit configured to manage the target track information using the classified line track information; and 
 a position and velocity predictor configured to predict a position and a velocity of the first target using the target track information. 
 
     
     
       5. The PCL system of  claim 4 , wherein the multiple target association unit is configured to generate a plurality of combinations by combining a plurality of pieces of line track information associated with the first target from among the plurality pieces of classified line track information when there is no target track information being managed, calculate reliability values indicating whether the plurality of combinations are information about the first target, and generate the target track information using a combination corresponding to a highest reliability value from among a plurality of reliability values corresponding to the plurality of combinations, and
 wherein the information about the first target is the bistatic range of the first target and the bistatic velocity of the first target. 
 
     
     
       6. The PCL system of  claim 5 , wherein the multiple target association unit is configured to associate the target track information with information of the combination corresponding to the highest reliability value when the reliability values are greater than a predetermined threshold value. 
     
     
       7. The PCL system of  claim 6 , wherein the multiple target association unit is configured to generate new target track information using line track information other than line track information associated with the target track information from among the plurality pieces of the classified line track information. 
     
     
       8. The PCL system of  claim 7 , wherein, when the target track information being managed is present, the multiple target association unit is configured to compare line track information corresponding to the target track at a first time with the plurality of pieces of line track information at a second time, and when corresponding line track information is present, update target track information at the second time using the corresponding line track information, and
 wherein the first time is prior to the second time, and the first time and the second time are repeated at specific intervals. 
 
     
     
       9. The PCL system of  claim 8 , wherein the multiple target association unit is configured to compare a position vector of the first target and a velocity vector of the first target at a fourth time, predicted at a third time, with a position vector of the first target and a velocity vector of the first target, measured at the fourth time, and check whether the first target predicted at the third time is the same as the first target measured at the fourth time,
 wherein a position vector of the first target and a velocity vector of the first target at the third time are configured to be predicted using the target track information, 
 wherein a position vector of the first target and a velocity vector of the first target at the fourth time are configured to be calculated using line track information used to update the target track information, and 
 wherein the third time is prior to the fourth time, and the third time and the fourth time are repeated at specific intervals. 
 
     
     
       10. The PCL system of  claim 9 , wherein, when the first target predicted at the third time is not the same as the first target measured at the fourth time, the multiple target association unit is configured to delete corresponding target track information. 
     
     
       11. The PCL system of  claim 10 , wherein the multiple target association unit is configured to associate a target track at the third time with a plurality of pieces of line track information corresponding to the first target at the fourth time when the first target predicted at the third time is the same as the first target measured at the fourth time. 
     
     
       12. The PCL system of  claim 11 , wherein, when the target track managed at the first time is updated, the multiple target association unit is configured to delete line track information associated with the target track from among the plurality pieces of the classified line track information and generate target track information using remaining line track information. 
     
     
       13. The PCL system of  claim 12 , wherein, when the target track managed at the first time is not updated, the multiple target association unit is configured to compare line track information corresponding to the target track at the first time with the plurality of pieces of line track information at the second time, and when corresponding line track information is present, update target track information at the second time using the corresponding line track information. 
     
     
       14. The PCL system of  claim 13 , wherein the multiple target association unit is configured to store the target track information as a structure.